Category
Logic & Paradoxes
Philosophical and logic puzzles that survive translation, solved step by step with a check record to download; paradoxes sorted by type and solution status.
3 entries
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Flagship entry
Hardest Logic Puzzle Ever: You Never Learn What 'Ja' Means
The hardest logic puzzle ever, solved in three questions: why a direct question fails, the embedded question that makes ja harmless, and all 96 cases checked.
Image credit
Illustration: Virtue & Paradox. Generated schematic illustration — not a photograph, artwork record or historical source. © Virtue & Paradox, all rights reserved.
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The Paradox Index: 9 Paradoxes, 5 With an Accepted Answer
A list of paradoxes with sources: Zeno's four, the liar, the heap, Meno's paradox and Carroll's two, each with its status in the SEP or IEP as of 2026.
Image credit
"Aristoteles Louvre" by Eric Gaba – Wikimedia Commons user: Sting — https://commons.wikimedia.org/wiki/File:Aristoteles_Louvre.jpg — CC BY-SA 2.5 (https://creativecommons.org/licenses/by-sa/2.5/)
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Zebra Puzzle: Drop Any One of Its 14 Clues and It Breaks
The Zebra Puzzle solved in seven steps, plus a full search: one arrangement fits all 14 clues, and 2 to 42 fit whenever any single clue is dropped.
Image credit
"Charles Hamilton Smith - The Zebra - B1981.25.2230 - Yale Center for British Art" by Charles Hamilton Smith; Yale Center for British Art, B1981.25.2230 — https://commons.wikimedia.org/wiki/File:Charles_Hamilton_Smith_-_The_Zebra_-_B1981.25.2230_-_Yale_Center_for_British_Art.jpg — Public domain (US: an unpublished work whose author died in 1859 entered the public domain at the end of 2002 (17 U.S.C. 303), and a work published before 1931 is also public domain; EU: Charles Hamilton Smith made the watercolor in 1837 and died in 1859, so the term of life plus 70 years ended in 1929; a faithful reproduction of a public-domain artwork creates no new right in the EU (Directive 2019/790, Art. 14))
